/*
 * jquery-ujs
 *
 * http://github.com/rails/jquery-ujs/blob/master/src/rails.js
 *
 * This rails.js file supports jQuery 1.4.3 and 1.4.4 .
 *
 */

jQuery(function ($) {
    var csrf_token = $('meta[name=csrf-token]').attr('content'),
            csrf_param = $('meta[name=csrf-param]').attr('content');

    $.fn.extend({
        /**
         * Triggers a custom event on an element and returns the event result
         * this is used to get around not being able to ensure callbacks are placed
         * at the end of the chain.
         *
         * TODO: deprecate with jQuery 1.4.2 release, in favor of subscribing to our
         *       own events and placing ourselves at the end of the chain.
         */
        triggerAndReturn: function (name, data) {
            var event = new $.Event(name);
            this.trigger(event, data);

            return event.result !== false;
        },

        /**
         * Handles execution of remote calls. Provides following callbacks:
         *
         * - ajax:beforeSend  - is executed before firing ajax call
         * - ajax:success  - is executed when status is success
         * - ajax:complete - is executed when the request finishes, whether in failure or success.
         * - ajax:error    - is execute in case of error
         */
        callRemote: function () {
            var el = this,
                    method = el.attr('method') || el.attr('data-method') || 'GET',
                    url = el.attr('action') || el.attr('href'),
                    dataType = el.attr('data-type') || ($.ajaxSettings && $.ajaxSettings.dataType);

            if (url === undefined) {
                throw "No URL specified for remote call (action or href must be present).";
            } else {
                var $this = $(this), data = el.is('form') ? el.serializeArray() : [];

                $.ajax({
                    url: url,
                    data: data,
                    dataType: dataType,
                    type: method.toUpperCase(),
                    beforeSend: function (xhr) {
                        xhr.setRequestHeader("Accept", "text/javascript");
                        if ($this.triggerHandler('ajax:beforeSend') === false) {
                            return false;
                        }
                    },
                    success: function (data, status, xhr) {
                        el.trigger('ajax:success', [data, status, xhr]);
                    },
                    complete: function (xhr) {
                        el.trigger('ajax:complete', xhr);
                    },
                    error: function (xhr, status, error) {
                        el.trigger('ajax:error', [xhr, status, error]);
                    }
                });
            }
        }
    });

    /**
     *  confirmation handler
     */

    $('body').delegate('a[data-confirm], button[data-confirm], input[data-confirm]', 'click.rails', function () {
        var el = $(this);
        if (el.triggerAndReturn('confirm')) {
            if (!confirm(el.attr('data-confirm'))) {
                return false;
            }
        }
    });


    /**
     * remote handlers
     */
    $('form[data-remote]').live('submit.rails', function (e) {
        $(this).callRemote();
        e.preventDefault();
    });

    $('a[data-remote],input[data-remote]').live('click.rails', function (e) {
        $(this).callRemote();
        e.preventDefault();
    });

    /**
     * <%= link_to "Delete", user_path(@user), :method => :delete, :confirm => "Are you sure?" %>
     *
     * <a href="/users/5" data-confirm="Are you sure?" data-method="delete" rel="nofollow">Delete</a>
     */
    $('a[data-method]:not([data-remote])').live('click.rails', function (e) {
        var link = $(this),
                href = link.attr('href'),
                method = link.attr('data-method'),
                form = $('<form method="post" action="' + href + '"></form>'),
                metadata_input = '<input name="_method" value="' + method + '" type="hidden" />';

        if (csrf_param !== undefined && csrf_token !== undefined) {
            metadata_input += '<input name="' + csrf_param + '" value="' + csrf_token + '" type="hidden" />';
        }

        form.hide()
                .append(metadata_input)
                .appendTo('body');

        e.preventDefault();
        form.submit();
    });

    /**
     * disable-with handlers
     */
    var disable_with_input_selector = 'input[data-disable-with]',
            disable_with_form_remote_selector = 'form[data-remote]:has(' + disable_with_input_selector + ')',
            disable_with_form_not_remote_selector = 'form:not([data-remote]):has(' + disable_with_input_selector + ')';

    var disable_with_input_function = function () {
        $(this).find(disable_with_input_selector).each(function () {
            var input = $(this);
            input.data('enable-with', input.val())
                    .attr('value', input.attr('data-disable-with'))
                    .attr('disabled', 'disabled');
        });
    };

    $(disable_with_form_remote_selector).live('ajax:before.rails', disable_with_input_function);
    $(disable_with_form_not_remote_selector).live('submit.rails', disable_with_input_function);

    $(disable_with_form_remote_selector).live('ajax:complete.rails', function () {
        $(this).find(disable_with_input_selector).each(function () {
            var input = $(this);
            input.removeAttr('disabled')
                    .val(input.data('enable-with'));
        });
    });

    var jqueryVersion = $().jquery;

    if (!( (jqueryVersion === '1.4.3') || (jqueryVersion === '1.4.4'))) {
        alert('This rails.js does not support the jQuery version you are using. Please read documentation.');
    }


});